Upgrading all eyecups of HoodLoupe, the teardrop video eyecup will block out ambient light and improve the LCD display. Installs in Seconds ... Remove the original HoodLope eyecup by lifting and removing the thin eyecup. Push down to the HoodLoupes visible end to install your new teardrop video eyecup. The teardrop eye cup is attached to the slip ring so you can keep it in place while adjusting the diopter and rotate it to the right or left eye position. (HoodLope is not included)